Throttle valve



P. H. scHElB THROTTLE VALVE Filed Decv, 7 1920 Mela Patented Aug. 7, 1923.

UNITED STATES- PATENT OFFICE.

PETER H. SCHEIB, OF DENVER, COLORADO, ASSIGNOR TO THE DENVER ROCK DRILL `MANUFACT'IIIRING COMPANY, OF vDENVER, COLORADO, A CORPORATION OF DELAWARE.

THROTTLE VALVE.

Application filed December 7, 1920. lSerial No. 428,941. i

To @ZZ whom t may concern:

Be it known that I, PETER H. SCHEIB, a citizen of the United States, residing at Denver, in the county of Denver. andpState of Colorado, have invented certain new andy useful Improvements in Throttle Valves, of which the following is a specification. i The present invention relates more particularly to throttle or controlling valves for rock drills, but may be utilized for vother purposes. As is well known, itis the common practice to employ rotary valves having tapered bearing portions. The pressure of the Ifluid against these valves is in a direction to force the taper portion into engagement with its seat. While `this is essential the pressure is often so great as to cause the valve to stick or be operable only under diiiiculty.` i

The primary object of thepresent invention is to provide means whereby the` pressure is in great measure relieved, though sufficient is maintainedr to secure the necessary seating action. Asa consequence the bearing is secured in snug condition, and yet is not so tight as to make the operation of the valve diiiicult.

An yembodiment of the invention that is at present considered the preferable one, is illustrated in the accompanying drawings,

Wherein:

Figure 1 is a longitudinal sectional view through a portion of a rock drill, showing the improved valve structure,

Figure 2 is a cross sectional view on the line 2-2 of Figure 1,

Figure 3 is a longitudinal sectional View on an enlarged scale through the valve structure.

In the embodiment disclosed7 a drill actuated motor is shown generally at 4:, and the usual fluid pressure operated feeding means on'its smallerend is an exposed operating handle 12` that is located at one end of the valve casing 7. An intake port 13 opens through the larger end and is in communicationY with lateral ports 14 and 15 that rare movable into and out of communication with the passageways 9 and 10 accordingly as the valve 11 is turned by its handle 12. The larger end ofthe valve is also provided with a reduced extension 16 that is generally cylindrical in form. ff y A plug 17 threaded into the opposite end of the valve casing 7 to the handle 12, secures in place a nipple 18 to which a motive fluid supply line, as for example a hose, may be connected. The bore 19 of this nipple is in line with the intake port 13 "of the valve.

The inner end of the plug 17 surrounds the extension 16 of the valve and carries ya packing gasket 2() thatl snugly receives the said extension. place hy aretaining collar 21 threaded into the inner end of the plug. The said inner end of the plug is spaced from the shoulder ,22. formed on the larger end ofthe valve,

thus producing a chamber 23, anda vent 24 opens from said chamber through the valve casing 7 to atmosphere.

With this structure it will be evident that the pressure of the motive fluid introduced i through the nipple 18 operates only against the end surface of the extension 16 and the bottom or closed end wall of the intake port 13, the .packing substantially cutting off the titi This packing gasket is held in passage of the fluid around the extension 16. Inasmuch as there may be and in practice usually is a slight amount of leakage past the packing, the vent 24` permits the escape of the fluid and prevents any building up of pressure against the shoulder 22. It will thus be evident that while there will be pressure againstthe valve sufiicient to hold it in its tapered seat, the amount of this pres` sure is relatively slight and the valve therefore is easily operable.

From the foregoing, it is thought that the construction, operation and many advan-` tages of the herein described invention will be apparent to vthose skilled in the art, without further description, and it will be uny derstood that various changesin the size,

shape, proportion and minor details of construction may he resorted to Without departing' from die spirit or saerilieing any olf the advantages ot the invention.

Haring; thus :fully described my invention, `what I claiin as new, and desire to Secure hy Letters Patent, is z- L In a structure o'l2 the character set forth, the combination with a rulye easing, of a tapered valve rotatably lnounted in the casing' and having an exposed operating handle at itsl smaller end.l means 'tor supplying Inotiye fluid to 'the casing the larger endL of the valve, and means for relieving a` portion ot said er end 'troni the pressure of the motive VLuid While retaining the preseine air. zinst the remainder.

2. In a structure ot the character set forth7 thecconihination with a Valve Casing, o'li e tepered valve rotatably nioui'ited 'in the cas ing and h a ving an exposed opera-thief handle at its snnller end, means Yfor supplying 1no ii-ire 'Huid to the easing; at Athe larger end of the valve, means for cutting ol the 'iluid 'from a portion ot the larger end oit the Valve, and rneans for allowing); the escape oit any leakage away troni aid portion.

In a structure oit the character set tortln the combination with a valve casing7 oil a tapered valve rotatably mounted in the easing;- and having an exposed oiverating handle at its smaller end and an ii'xtalre port in its larger eno, ineane for suppl'l'y'ing motive i luid to -said larger end, a passageway around said larger end, and a vent port troni Said passagew y opening to eti'nosphere.

le In a structure of the character set forth, the combination with e Valve casing', of a rotary throttle valve thereinhevirean eX- posed handle at one end and .an intake port opening through the opposite end, said. latter end having a reduced exteneion forming a shoulder, a packing element .surrounding,

the extension, a vent port opening betweenA the shoulder and packing element, and ineens for supplying fluid under pressure te the intake port.

5. In a structure of the chara-icte set forth, the combination with a valve casing, olt a rotary tapered throttle valve therein havingl an exposed handle at its snlallor end and an intake port openingthrough the larger end, said latter end having a reduced ,ntension forming a Shoulder, a packing' elen''fnt :mrrounding the extension and paced 'trom the shoulder forming a chaniher, a, Vent port Opening` into the chamber, and. means tor supply/Ying; duid under preesure to the intake port.

In a. strueture et' the ehm-acte toi-th. the combination with a valve eaeing, ol' a rotary throttle valve therein ha no' van exposed handle at one end and an intake port opening; through the opposite end, said lat-- ter end haring' a reduced extension forru` ing a shoulder., a plugl iu the valve casingr surrounding 'the exteneion7 and packing' held hy said plug and cooperating' With the extension. Said valve casing' having a lvelt port between the plug; and shoulder.

In testimony Whereot, I aflix my si ture in the presence of two Witneeses.

PETER H. SCIIEIB,

Witnesses SALLEM V. JOHNOM, H. C. GUsTArsoN. 

